2 Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #include <boost/bind.hpp>
22 #include <wx/graphics.h>
23 #include "audio_plot.h"
24 #include "lib/audio_decoder.h"
25 #include "lib/audio_analysis.h"
26 #include "wx/wx_util.h"
34 using boost::shared_ptr;
36 int const AudioPlot::_minimum = -70;
37 int const AudioPlot::max_smoothing = 128;
39 AudioPlot::AudioPlot (wxWindow* parent)
40 : wxPanel (parent, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE)
42 , _smoothing (max_smoothing / 2)
43 , _message (_("Please wait; audio is being analysed..."))
46 SetDoubleBuffered (true);
49 for (int i = 0; i < MAX_AUDIO_CHANNELS; ++i) {
50 _channel_visible[i] = false;
53 for (int i = 0; i < AudioPoint::COUNT; ++i) {
54 _type_visible[i] = false;
57 _colours.push_back (wxColour ( 0, 0, 0));
58 _colours.push_back (wxColour (255, 0, 0));
59 _colours.push_back (wxColour ( 0, 255, 0));
60 _colours.push_back (wxColour (139, 0, 204));
61 _colours.push_back (wxColour ( 0, 0, 255));
62 _colours.push_back (wxColour ( 0, 139, 0));
63 _colours.push_back (wxColour ( 0, 0, 139));
64 _colours.push_back (wxColour (255, 255, 0));
65 _colours.push_back (wxColour ( 0, 255, 255));
66 _colours.push_back (wxColour (255, 0, 255));
67 _colours.push_back (wxColour (255, 0, 139));
68 _colours.push_back (wxColour (139, 0, 255));
70 #if MAX_AUDIO_CHANNELS != 12
71 #warning AudioPlot::AudioPlot is expecting the wrong MAX_AUDIO_CHANNELS
74 Bind (wxEVT_PAINT, boost::bind (&AudioPlot::paint, this));
76 SetMinSize (wxSize (640, 512));
80 AudioPlot::set_analysis (shared_ptr<AudioAnalysis> a)
84 for (int i = 0; i < MAX_AUDIO_CHANNELS; ++i) {
85 _channel_visible[i] = false;
88 for (int i = 0; i < AudioPoint::COUNT; ++i) {
89 _type_visible[i] = false;
96 AudioPlot::set_channel_visible (int c, bool v)
98 _channel_visible[c] = v;
103 AudioPlot::set_type_visible (int t, bool v)
105 _type_visible[t] = v;
110 AudioPlot::set_message (wxString s)
118 double db_label_width;
130 wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
135 if (!_analysis || _analysis->channels() == 0) {
136 gc->SetFont (gc->CreateFont (*wxNORMAL_FONT));
137 gc->DrawText (_message, 32, 32);
141 wxGraphicsPath grid = gc->CreatePath ();
142 gc->SetFont (gc->CreateFont (*wxSMALL_FONT));
143 wxDouble db_label_height;
144 wxDouble db_label_descent;
145 wxDouble db_label_leading;
147 gc->GetTextExtent (wxT ("-80dB"), &metrics.db_label_width, &db_label_height, &db_label_descent, &db_label_leading);
149 metrics.db_label_width += 8;
151 int const data_width = GetSize().GetWidth() - metrics.db_label_width;
152 /* Assume all channels have the same number of points */
153 metrics.x_scale = data_width / float (_analysis->points (0));
154 metrics.height = GetSize().GetHeight ();
155 metrics.y_origin = 32;
156 metrics.y_scale = (metrics.height - metrics.y_origin) / -_minimum;
158 for (int i = _minimum; i <= 0; i += 10) {
159 int const y = (metrics.height - (i - _minimum) * metrics.y_scale) - metrics.y_origin;
160 grid.MoveToPoint (metrics.db_label_width - 4, y);
161 grid.AddLineToPoint (metrics.db_label_width + data_width, y);
162 gc->DrawText (std_to_wx (String::compose ("%1dB", i)), 0, y - (db_label_height / 2));
165 gc->SetPen (*wxLIGHT_GREY_PEN);
166 gc->StrokePath (grid);
168 gc->DrawText (_("Time"), data_width, metrics.height - metrics.y_origin + db_label_height / 2);
170 if (_type_visible[AudioPoint::PEAK]) {
171 for (int c = 0; c < MAX_AUDIO_CHANNELS; ++c) {
172 wxGraphicsPath p = gc->CreatePath ();
173 if (_channel_visible[c] && c < _analysis->channels()) {
174 plot_peak (p, c, metrics);
176 wxColour const col = _colours[c];
177 gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (col.Red(), col.Green(), col.Blue(), col.Alpha() / 2), 1, wxPENSTYLE_SOLID));
182 if (_type_visible[AudioPoint::RMS]) {
183 for (int c = 0; c < MAX_AUDIO_CHANNELS; ++c) {
184 wxGraphicsPath p = gc->CreatePath ();
185 if (_channel_visible[c] && c < _analysis->channels()) {
186 plot_rms (p, c, metrics);
188 wxColour const col = _colours[c];
189 gc->SetPen (*wxThePenList->FindOrCreatePen (col, 1, wxPENSTYLE_SOLID));
194 wxGraphicsPath axes = gc->CreatePath ();
195 axes.MoveToPoint (metrics.db_label_width, 0);
196 axes.AddLineToPoint (metrics.db_label_width, metrics.height - metrics.y_origin);
197 axes.AddLineToPoint (metrics.db_label_width + data_width, metrics.height - metrics.y_origin);
198 gc->SetPen (*wxBLACK_PEN);
199 gc->StrokePath (axes);
205 AudioPlot::y_for_linear (float p, Metrics const & metrics) const
211 return metrics.height - (20 * log10(p) - _minimum + _gain) * metrics.y_scale - metrics.y_origin;
215 AudioPlot::plot_peak (wxGraphicsPath& path, int channel, Metrics const & metrics) const
217 if (_analysis->points (channel) == 0) {
221 path.MoveToPoint (metrics.db_label_width, y_for_linear (_analysis->get_point(channel, 0)[AudioPoint::PEAK], metrics));
224 int const N = _analysis->points(channel);
225 for (int i = 0; i < N; ++i) {
226 float const p = _analysis->get_point(channel, i)[AudioPoint::PEAK];
227 peak -= 0.01f * (1 - log10 (_smoothing) / log10 (max_smoothing));
230 } else if (peak < 0) {
234 path.AddLineToPoint (metrics.db_label_width + i * metrics.x_scale, y_for_linear (peak, metrics));
239 AudioPlot::plot_rms (wxGraphicsPath& path, int channel, Metrics const & metrics) const
241 if (_analysis->points (channel) == 0) {
245 path.MoveToPoint (metrics.db_label_width, y_for_linear (_analysis->get_point(channel, 0)[AudioPoint::RMS], metrics));
247 list<float> smoothing;
249 int const N = _analysis->points(channel);
251 float const first = _analysis->get_point(channel, 0)[AudioPoint::RMS];
252 float const last = _analysis->get_point(channel, N - 1)[AudioPoint::RMS];
254 int const before = _smoothing / 2;
255 int const after = _smoothing - before;
257 /* Pre-load the smoothing list */
258 for (int i = 0; i < before; ++i) {
259 smoothing.push_back (first);
261 for (int i = 0; i < after; ++i) {
263 smoothing.push_back (_analysis->get_point(channel, i)[AudioPoint::RMS]);
265 smoothing.push_back (last);
269 for (int i = 0; i < N; ++i) {
271 int const next_for_window = i + after;
273 if (next_for_window < N) {
274 smoothing.push_back (_analysis->get_point(channel, i)[AudioPoint::RMS]);
276 smoothing.push_back (last);
279 smoothing.pop_front ();
282 for (list<float>::const_iterator j = smoothing.begin(); j != smoothing.end(); ++j) {
286 if (smoothing.size() > 0) {
287 p = sqrt (p / smoothing.size ());
290 path.AddLineToPoint (metrics.db_label_width + i * metrics.x_scale, y_for_linear (p, metrics));
295 AudioPlot::set_gain (float g)
302 AudioPlot::set_smoothing (int s)